package com.atguigu.eduservice.listener;

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.atguigu.commonutils.ResultCode;
import com.atguigu.eduservice.entity.EduSubject;
import com.atguigu.eduservice.entity.excel.SubjectData;
import com.atguigu.eduservice.service.EduSubjectService;
import com.atguigu.servicebase.exceptionhandler.GuliException;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import org.springframework.util.StringUtils;

/**
 * User:曹帅
 * Date:2021/2/8
 * Version:1.0
 * 这个是监听器，是不能在Spring容器里面进行管理的，需要自己new
 * 所以，它也是无法使用容器里面的东西的
 */
public class SubjectExcelListener extends AnalysisEventListener<SubjectData> {

    public EduSubjectService subjectService;

    public SubjectExcelListener() {
    }

    public SubjectExcelListener(EduSubjectService subjectService) {
        this.subjectService = subjectService;
    }


    @Override
    public void invoke(SubjectData subjectData, AnalysisContext analysisContext) {
        if (StringUtils.isEmpty(subjectData)) {
            throw new GuliException(ResultCode.ERROR, "文件数据为空");
        }

        //一行一行读取，每次读取有两个值，第一个是一级分类，第二个二级分类
        //判断一级分类是否重复
        EduSubject existOneSubject = this.existOneSubject(subjectService, subjectData.getOneSubjectName());
        if (StringUtils.isEmpty(existOneSubject)) {
            existOneSubject = new EduSubject();
            existOneSubject.setParentId("0");
            existOneSubject.setTitle(subjectData.getOneSubjectName());
            subjectService.save(existOneSubject);
        }
        //获取一级分类的id值
        String pid = existOneSubject.getId();
        //添加二级分类
        EduSubject existTwoSubject = this.existTwoSubject(subjectService, subjectData.getTwoSubjectName(), pid);
        if (StringUtils.isEmpty(existTwoSubject)) {
            existTwoSubject = new EduSubject();
            existTwoSubject.setParentId(pid);
            existTwoSubject.setTitle(subjectData.getTwoSubjectName());
            subjectService.save(existTwoSubject);
        }
    }

    //判断一级分类不能重复添加
    private EduSubject existOneSubject(EduSubjectService subjectService, String subjectName) {
        QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
        wrapper.eq("title", subjectName)
                .eq("parent_id", "0");
        EduSubject eduSubject = subjectService.getOne(wrapper);
        return eduSubject;
    }

    //判断二级分类不能重复添加
    private EduSubject existTwoSubject(EduSubjectService subjectService, String subjectName,String pid) {
        QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
        wrapper.eq("title", subjectName)
                .eq("parent_id", pid);
        EduSubject twoSubject = subjectService.getOne(wrapper);
        return twoSubject;
    }


    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {

    }
}
